/**
 * 
 */
package com.marphian.fc;

import com.marphian.fc.DictionaryDatabase;

import android.app.SearchManager;
import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.net.Uri;
import android.provider.BaseColumns;

/**
 * @author scjb
 *
 */
public class DictionaryProvider extends ContentProvider{

    String TAG = "DictionaryProvider";

    public static String AUTHORITY = "com.marphian.fc.DictionaryProvider";
    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/CCCEDICT");

    // MIME types used for searching words or looking up a single definition
    public static final String WORDS_MIME_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE +
                                                  "/vnd.marphian.fc.flashcardapp";
    public static final String DEFINITION_MIME_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE +
                                                       "/vnd.marphian.fc.flashcardapp";

    private DictionaryDatabase mDictionary;

    // UriMatcher stuff
    private static final int SEARCH_WORDS = 0;
    private static final int GET_WORD = 1;
    private static final int SEARCH_SUGGEST = 2;
    private static final int REFRESH_SHORTCUT = 3;
    private static final UriMatcher sURIMatcher = buildUriMatcher();
	
    /**
     * Builds up a UriMatcher for search suggestion and shortcut refresh queries.
     */
    private static UriMatcher buildUriMatcher() {
        UriMatcher matcher =  new UriMatcher(UriMatcher.NO_MATCH);
        // to get definitions...
        matcher.addURI(AUTHORITY, "CCCEDICT", SEARCH_WORDS);
        matcher.addURI(AUTHORITY, "CCCEDICT/#", GET_WORD);
        // to get suggestions...
        matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, SEARCH_SUGGEST);
        matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", SEARCH_SUGGEST);

        /* The following are unused in this implementation, but if we include
         * {@link SearchManager#SUGGEST_COLUMN_SHORTCUT_ID} as a column in our suggestions table, we
         * could expect to receive refresh queries when a shortcutted suggestion is displayed in
         * Quick Search Box, in which case, the following Uris would be provided and we
         * would return a cursor with a single item representing the refreshed suggestion data.
         */
        matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_SHORTCUT, REFRESH_SHORTCUT);
        matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_SHORTCUT + "/*", REFRESH_SHORTCUT);
        return matcher;
    }
    
    /**
     * This method is required in order to query the supported types.
     * It's also useful in our own query() method to determine the type of Uri received.
     */
    @Override
    public String getType(Uri uri) {
        switch (sURIMatcher.match(uri)) {
            case SEARCH_WORDS:
                return WORDS_MIME_TYPE;
            case GET_WORD:
                return DEFINITION_MIME_TYPE;
            case SEARCH_SUGGEST:
                return SearchManager.SUGGEST_MIME_TYPE;
            case REFRESH_SHORTCUT:
                return SearchManager.SHORTCUT_MIME_TYPE;
            default:
                throw new IllegalArgumentException("Unknown URL " + uri);
        }
    }
	@Override
	public boolean onCreate() {
		mDictionary = new DictionaryDatabase(getContext());
        return true;
	}

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
                        String sortOrder) {
		// Use the UriMatcher to see what kind of query we have and format the db query accordingly
        switch (sURIMatcher.match(uri)) {
            case SEARCH_SUGGEST:
                if (selectionArgs == null) {
                  throw new IllegalArgumentException(
                      "selectionArgs must be provided for the Uri: " + uri);
                }
                return getSuggestions(selectionArgs[0]);
            case SEARCH_WORDS:
                if (selectionArgs == null) {
                  throw new IllegalArgumentException(
                      "selectionArgs must be provided for the Uri: " + uri);
                }
                return search(selectionArgs[0]);
            case GET_WORD:
                return getWord(uri);
            case REFRESH_SHORTCUT:
                return refreshShortcut(uri);
            default:
                throw new IllegalArgumentException("Unknown Uri: " + uri);
        }
	}
    
    private Cursor getSuggestions(String query) {
        query = query.toLowerCase();
        String[] columns = new String[] {
            BaseColumns._ID,
            DictionaryDatabase.KEY_WORD,
            DictionaryDatabase.KEY_DEFINITION,
         /* SearchManager.SUGGEST_COLUMN_SHORTCUT_ID,
                          (only if you want to refresh shortcuts) */
            SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID};

        return mDictionary.getWordMatches(query, columns);
      }

    private Cursor search(String query) {
        query = query.toLowerCase();
        String[] columns = new String[] {
            BaseColumns._ID,
            DictionaryDatabase.KEY_WORD,
            DictionaryDatabase.KEY_DEFINITION};

        return mDictionary.getWordMatches(query, columns);
      }

    
    private Cursor getWord(Uri uri) {
        String rowId = uri.getLastPathSegment();
        String[] columns = new String[] {
            DictionaryDatabase.KEY_WORD,
            DictionaryDatabase.KEY_DEFINITION};

        return mDictionary.getWord(rowId, columns);
      }

      private Cursor refreshShortcut(Uri uri) {
        /* This won't be called with the current implementation, but if we include
         * {@link SearchManager#SUGGEST_COLUMN_SHORTCUT_ID} as a column in our suggestions table, we
         * could expect to receive refresh queries when a shortcutted suggestion is displayed in
         * Quick Search Box. In which case, this method will query the table for the specific
         * word, using the given item Uri and provide all the columns originally provided with the
         * suggestion query.
         */
        String rowId = uri.getLastPathSegment();
        String[] columns = new String[] {
            BaseColumns._ID,
            DictionaryDatabase.KEY_WORD,
            DictionaryDatabase.KEY_DEFINITION,
            SearchManager.SUGGEST_COLUMN_SHORTCUT_ID,
            SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID};

        return mDictionary.getWord(rowId, columns);
      }
    
      // Other required implementations...

      @Override
      public Uri insert(Uri uri, ContentValues values) {
          throw new UnsupportedOperationException();
      }

      @Override
      public int delete(Uri uri, String selection, String[] selectionArgs) {
          throw new UnsupportedOperationException();
      }

      @Override
      public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
          throw new UnsupportedOperationException();
      }

}
